appenlight: detect and disable appenlight if not installed

rhodecode/lib/middleware/appenlight.py

@@ -21,10 +21,19 b''
 """
 middleware to handle appenlight publishing of errors
 """
+import logging
 
-from appenlight_client import make_appenlight_middleware
-from appenlight_client.exceptions import get_current_traceback
-from appenlight_client.wsgi import AppenlightWSGIWrapper
+log = logging.getLogger(__name__)
+
+appenlight_installed = False
+
+try:
+    from appenlight_client import make_appenlight_middleware
+    from appenlight_client.exceptions import get_current_traceback
+    from appenlight_client.wsgi import AppenlightWSGIWrapper
+    appenlight_installed = True
+except ImportError:
+    log.info('Appenlight packages not present, skipping appenlight setup')
 
 
 def track_exception(environ):
@@ -63,7 +72,7 b' def wrap_in_appenlight_if_enabled(app, s'
        This is in use to support our setup of the vcs related middlewares.
 
     """
-    if settings['appenlight']:
+    if appenlight_installed and settings['appenlight']:
         app = RemoteTracebackTracker(app)
         if not appenlight_client:
             app = make_appenlight_middleware(app, settings)